If I ______ about this computer program, a hage amount of time and energy would

题干

If I ______ about this computer program, a hage amount of time and energy would have been saved.

A．know

B．knew

C．had known

D．have known

上一题下一题 0.64难度单项选择更新时间:2013-03-05 09:50:26

小学学科试题库

初中学科试题库

高中学科试题库